Densification of Alumina Ceramics by Infiltration of a Nano-Sized Alumina Sol into Alumina Green Samples

Shu Wen Jiang; Gui Ling Ning

doi:10.4028/www.scientific.net/MSF.675-677.183

Paper Titles

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Effects of Carbon Source on Fabrication and Characterization of Porous Silicon Nitride Ceramics by Carbothermal Reduction
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Synthesis of Pr₆O₁₁ Doped ZnO-Based Varistors by Pyrogenic Decomposition of Nitrate
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Densification of Alumina Ceramics by Infiltration of a Nano-Sized Alumina Sol into Alumina Green Samples
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Thermodynamic Model and Synthesis of Bulk Metallic Glass in Cu-Zr-Ti System by Mechanical Alloying
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Oxidation Kinetic and Diffusion Mechanism Study of a Zr-Based Bulk Metallic Glass Alloy
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Effect of Nb Addition on the Structural and Mechanical Properties of Cu₄₆Zr₄₂Al₇Y₅ Bulk Metallic Glass
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Densification of Alumina Ceramics by Infiltration of a Nano-Sized Alumina Sol into Alumina Green Samples

Abstract:

Infiltration of a nano-sized alumina sol into the green bodies is proposed to facilitate the ceramic sintering. The green samples were prepared by a colloidal processing based on drying induced forming, and then were immersed in a nano-sized alumina sol prior to their sintering at 1350-1600 oC. The alumina sol was characterized by using transmission electron microscopy and the grain structure of sintered alumina ceramics were examined by scanning electron microscopy. Significant densification of sintered samples was evidenced, in a depth of ~ 0.5 mm, on the samples treated with the alumina sol infiltration. It is indicated that filling of nano-sol into the micro-pores between particles of green samples enhanced the sintering densification process. The infiltration treatment by nano-sol may also provide an effective way to produce structurally gradient ceramics with a gradual changing density and/or composition from the surface into bulk.